Question about 2002 kawasaki KDX 125

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Kdx 125 has good spark but wont fire up

Bike has a spark but wont fire up i have cleaned carb out took off the head cheacked piston&rings they are ok but still wont fire at all

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Knowing that there is no starter motor, I suspect that there is, in the presence of " good spark", a dearth of GASOLINE!

Posted on Nov 12, 2012

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Have you checked the engine earth from the starter motor?

Posted on Feb 22, 2010

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Stihl TS400 stone cutter not working (no compression) so replaced piston rings, new gasket kit and clean for carb new spark plug (good spark when engin turned over) cleaned all air filters, replaced all...


You did not indicate whether or not you have compression now that you have changed out the gaskets and piston rings. If not, it seems to me that the problem could be a) cracked head or block, b) bad valve(s) or even c) a warped head.

Sorry for the bad news (if I am right).

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Self diagnostics


First thing would be to cheak the compression,has the bike been stood for a long time, if so the piston rings can become seized into the pistons and although it my appear to run on starter fluid sprayed into the carbs its not really running just firing.
If the compression is low then you will need to remove the head and barrel the determine why there is no compression.
I had the same problem on a gsx550 turned out to be frozen ring, removed carefully cleaned well and replaced and it ran ok.

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1985honda spree good spark wont fire not even with starting fluid


have you checked for good compression? maybe the piston rings a shot
also make sure that the exhaust is not blocked
where are you spraying the starting fluid? into the airbox or straight into the carb

the other thing you could try is removing the plug and spraying directly into the head the quickly replacing the plug and kicking the bike if this dosnt work then the ring are deffintly broken

hope this helps

John

Apr 05, 2011 | Honda CBX 550 F-F2 Motorcycles

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Hi, I just bought a stock 2003 ttr 125. The bike had been sitting for years and barely would run. I took the air filter out and it was full of gasoline. I took the carb apart and cleaned all the gummed...


Piston rings may be sticking after sitting for so long. It may serve you well to remove the top end, paying special attention to the timing alignment as you do. Visually inspect the piston and rings. ensure the rings can move freely in their grooves. Look at the piston for signs of blow-by. A burned up surface of the piston that extends past the rings onto the skirts. You may simply re-ring this machine and it would solve your problem if you view these problems.

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Got a spark but bike wont fire upi have cleaned carb took head off cheacked piston &rings they are fine but bike does not fire at all


Even tho u have got a spark dose not mean the spark plug is ok try changing the spark plug and i would recheck u carb to see if the flots in the bottom of the carb are still inplace correctly if u have any more problems please get back to me i will be more than happy to help i have worked on at least 100+ of these bikes

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1 Answer

I have a 1974 dt 250 same as an dt 360 the bike has sat in a barn about 4 yrs it will not start removed and cleaned the gas tank went thur the carb new plug used ignition coil compression about 50 to 75...


Compression is too low!

Replace the piston rings.

Also check continuity from engine to frame till high-tension coil...
Check if breaker points aren't dirty ( clean out with fine sandpaper )
Check breakerpoint settings

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I got a 1995 cr250 dirtbike and i have a problem starting it it wont start but keeps back firing the bike has a bran new rebuild it allways had a problem starting it. but now it wont start i took the carb...


im thinking if it has spark and getting gas and has compression, the bike will run. sometimes a "WEAK" coil will give a good spark, but under compresion its not enough to ignite the fuel. if thats not the case, take the air filter off and spray starting fluid into the carb and with NO CHOKE, give it full throttle and kick it over. if that dont do it try compression starting it, tow it for some distance if you have to. if that dont do it, then there must be something wrong with the carb. jets, fuel air adjustment. thats all i have. good luck.

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1 Answer

Bike bogged down like plug fouled now wont start


Based on the information given, I think you may have a hole in the top of the piston. It sounds like pre-ignition, ( AKA detonation and engine knock ). Pull the cylinder head and check the piston and cylinder head. Sometimes the top outer edge of the piston disintegrates due to the heat. Replace the piston and rings and remove the carbon from the head. Be sure you run 32/1 mix on gas and oil. That's 4oz two stroke oil per gallon of gas. Only use premium gas.

Remove and clean the carb. Be sure the carb mount bolts and carb manifold bolts are tight. An air leak will cause the engine to run hot.

Please rate this solution. Thanks

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timing could be slightly take the magneto casing off then remove the cylinder head when the piston is at the top of cylinder head a metal lump on the magneto should line up with the first or second marking on the casing behind the magneto, carb might need cleaning,if its been rebuilt because of piston ring blowing then maybe they didnt skim your head properly your best off takin the bike apart which really aint that differcult go up to the main engine lump and you wont have that many problems

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